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pedwards2932 View Drop Down
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Posts: 337 		Direct Link To This Post Topic: Tire Pressure Monitoring System
    Posted: 08 Oct 2020 at 7:45pm
I didn't see anywhere on the forum where anyone was using a TPMS.  With a single axle trailer I would think a flat tire could be a disaster.  I got a Tymate system off Amazon.....cost $70.  It measures temperature and air pressure.  You can set the high pressure alarm, low pressure alarm, and high temperature alarm.  It also has a fast leakage alert.  In the info it says these aren't for trailers I guess because of the distance from the tires but in reviews a lot of folks said they worked fine on trailers.  At any rate I'm going to try it and see if it works.  If it does I think it is worth it as an extra measure of safety.
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StephenH View Drop Down
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Posts: 6285 		Direct Link To This Post Posted: 08 Oct 2020 at 8:44pm
Please report on your results. I have thought about getting one also.
StephenH
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ouR escaPOD mods
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pedwards2932 View Drop Down
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Posts: 337 		Direct Link To This Post Posted: 08 Oct 2020 at 8:48pm
Will do.......going to use it this Tuesday will report and add pics if it works.
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pedwards2932 View Drop Down
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Posts: 337 		Direct Link To This Post Posted: 09 Oct 2020 at 11:33am
I checked and the tires that are on my RP189 are Load rating E and max pressure  80 psi cold.  80 seems a bit high to me?  From what I have read you should inflate to max psi.  My TPMS is good to 87 psi max.  I am thinking maybe 70 to 75 psi would be okay.  Any thoughts?
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mcarter View Drop Down
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Posts: 3419 		Direct Link To This Post Posted: 09 Oct 2020 at 12:27pm
Couple things - I have been using a TPMS for years, did a review on it. EEZ Go on the two TT tires, works great. I inflate to maximum on trailer tires.
Mike Carter
2015 178
" I had the right to remain silent, I just didn't have the ability."
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StephenH View Drop Down
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Posts: 6285 		Direct Link To This Post Posted: 09 Oct 2020 at 12:29pm
LR-E tires are a bit excessive. I have LR-D tires on mine which are inflated to 65 psi. However, I would think that inflating to 80 psi for the LR-E tires would be correct, although that would give a harsher ride. The TPMS should handle that. At the proper inflation, the tires should not exceed the TPMS rating.
StephenH
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GlueGuy View Drop Down
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Posts: 2627 		Direct Link To This Post Posted: 09 Oct 2020 at 1:28pm
LRE tires are a bit of overkill for an Rpod, but 80 PSI is generally the right pressure for them. They will be very, very stiff because of the light weight. LRD would be more appropriate, and they are generally inflated to 65 PSI.
bp
2017 R-Pod 179 Hood River
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pedwards2932 View Drop Down
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Posts: 337 		Direct Link To This Post Posted: 09 Oct 2020 at 1:56pm
The tires came with the trailer and they are brand new so I'd like to use them.  I'll try it at 80 psi and see how it goes.  Thanks.
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Colt View Drop Down
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Posts: 383 		Direct Link To This Post Posted: 09 Oct 2020 at 3:41pm
There is some leeway in the inflation pressure, but exercise caution and wisdom.  Some manufacturers provide load vs pressure charts.  Check to see if yours does.  Others say the higher load rating tires will be naturally stiff enough that reduced pressure won't soften the ride appreciably, but you can try it and see.  However, a high load tire carrying light weight is not likely to flex excessively if the pressure is reduced a *little* so, they should not be heating too much.  Charts from Goodyear and Maxxis imply that. 
My OEM tires were rated for almost exactly what the axle was rated, no reserve capacity.  So, I went up to a D to get a little "mohr", and do run max pressure to get the extra rating. 
John
'16 R-Pod 180
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offgrid View Drop Down
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Posts: 5290 		Direct Link To This Post Posted: 09 Oct 2020 at 5:04pm
Trailer tires have thick sidewalls, so they don't transfer heat through the sidewalls well. That is fine if you inflate them to their specs but if you underinflate them they will flex more and heat up. That's why its generally recommended to inflate trailer tires to their specified pressure cold. 

You probably can get away with 70 or 75 psi but what I'd suggest is getting an IR thermometer and checking their temps when you make a fuel stop. Only adds a few seconds to your walkaround inspection. If you do a highway run at 80 psi as a baseline and then one at 70 and the sidewalls aren't appreciably warmer then you're good.

Super useful tool. You can also use it to check bearing temps and brake temps after a long descent too. Once I got mine I've founds numerous uses for it, now I'm not sure how I ever did without it.

 
1994 Chinook Concourse
1995 RV6A Experimental Aircraft
2015 Rpod 179 - sold
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